Difference Between GenericServlet and HttpServlet?

Difference Between GenericServlet and HttpServlet?

Generic Servlet:

• GenericServlet class is direct subclass of Servlet interface.
• Generic Servlet is protocol independent.It handles all types  of protocol  like http, smtp, ftp etc.
• Generic Servlet only supports  service() method.It handles only simple request 
  public void service(ServletRequest req,ServletResponse res ).
• Generic Servlet only supports  service() method.

HttpServlet:

• HttpServlet class is the direct subclass of Generic Servlet.
• HttpServlet is protocol dependent. It handles only http protocol.
• HttpServlet  supports public void service(ServletRequest req,ServletResponse res ) and protected void service(HttpServletRequest req,HttpServletResponse res).
• HttpServlet supports also   doGet(),doPost(),doPut(),doDelete(),doHead(),doTrace(),doOptions()etc.